Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (26.46 USD): FIN4869
Coupon (27.34 USD): BANGGOODSD
(CouponsFromChina.com tip: just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 78da70, FLSTNE, ECFKL, BGBFCR40, AXMAS, BGAB20, BGASTROLUX, BGAST25, BGAFF10OFF, BGCuponation10, 4BLF, BG10OFFAFF, BGwhielabel, BGflashlight, BG10OFFAFF1
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Astrolux K1 XP-G3 Bronze Keychain Flashlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).